Cisco 400-051 Online Practice Questions and Exam Preparation

Cisco 400-051 Online Questions & Answers

• Question 171:

  In a single split Cisco Meeting Server deployment, which three software components are required when you're using external WebRTC? (Choose three.)

  A. Streamer
  B. Web Bridge
  C. Recorder
  D. XMPP Server
  E. Load Balancer
  F. TURN Server
  B. Web Bridge
  D. XMPP Server
  F. TURN Server

• Question 172:

  What is the maximum number of Cisco Unified Communications Manager subscriber pairs in a megacluster deployment?

  A. 2
  B. 4
  C. 6
  D. 8
  D. 8

• Question 173:

  Refer to the exhibit.

  

  Cisco Unified CM users report that they hear dead air during call transfer but bi-directional audio resumes after the transferees answer the call. The transferees are located across a SIP trunk. A collaboration engineer is checking the sip trunk configuration on the Cisco Unified CM.

  Which two configuration changes fix this problem? (Choose two)

  A. Assign a Media Resource Group List to the SIP Trunk.
  B. Place a check mark on Media Termination Point Required.
  C. Make sure there is an Annunciator Resource available on the MRGL.
  D. Modify the call Classification on the SIP trunk to OnNet.
  E. Change the "Send H225 User Info" service parameter to "Use ANN for Ringback".
  A. Assign a Media Resource Group List to the SIP Trunk.
  B. Place a check mark on Media Termination Point Required.

• Question 174:

  Refer to the exhibit.

  

  What caused this message on a Cisco 9971 IP phone, connected to a Cisco 3750X PoE switch, when a mobile phone is plugged into the IP Phone's back USB port?

  A. The back USB port only supports Cisco USB devices such as a Cisco Unified Video camera
  B. USB classes for this USB port are not properly configured
  C. The USB port is not enabled by the administrator
  D. The mobile phone is requesting more power than the USB port could provide
  E. USB devices are not supported when the IP phone is powered by a Cisco PoE switch
  D. The mobile phone is requesting more power than the USB port could provide

• Question 175:

  Which two applications can connect directly with a Cisco Unified Communications Manager Session Management Edition cluster? (Choose two.)

  A. Cisco Unity
  B. Cisco Unified Meeting Place Express
  C. Cisco Unified Contact Center Enterprise
  D. Cisco Unified Contact Center Express
  E. Cisco Unified Communications Manager Attendant Console
  F. Cisco Emergency Responder
  A. Cisco Unity
  B. Cisco Unified Meeting Place Express

  ---

  The deployment of a Unified CM Session Management Edition enables commonly used applications such as conferencing or videoconferencing to connect directly to the Session Management cluster, thus reducing the overhead of managing multiple trunks to leaf systems. Cisco Unity or other voicemail systems can be deployed at all sites and integrated into the Unified CM cluster.

• Question 176:

  Refer to the exhibit.

  

  How many SIP signaling dialog(s) took place in this SIP message exchange between two SIP user agents?

  A. 1
  B. 2
  C. 3
  D. 4
  E. 5
  F. 6
  A. 1

  ---

  During the establishment, maintenance and termination of a SIP session, signaling messages are exchanged between the two SIP endpoints. There are two different kinds of signaling "conversations" that those messages take part in: transactions and dialogs. A transaction is a SIP message exchange between two user-agents that starts with a request and ends with its final response (it can also contain zero or more provisional responses in between). For example, during the termination of a SIP session, one user releases the call by sending a BYE request and the other party replies back with a 200 OK response. This message exchange is called a transaction. But what happens in the case of the INVITE request? The establishment of a SIP session starts basically with an INVITE request and is considered as completed upon the receipt of the ACK. In this case, the transaction starts with the INVITE request and ends with the 200 OK, so the ACK is not part of the transaction. The ACK can be considered as a transaction on its own. However, when the final response to an INVITE is not a 2xx response, then the ACK is considered as part of the transaction. A dialog is a complete exchange of SIP messages between two user-agents. That means that transactions are actually parts of a dialog. For example, in the case of a SIP session establishment, a dialog starts with the INVITE-200 OK transaction, continues with the ACK and ends with the BYE-200 OK transaction. The picture below depicts the dialog and transactions that take place during the establishment of a SIP session:

  

  Note: There can also be subsequent requests that belong to the same dialog, such as a BYE or a re-INVITE message. As out-of-dialog requests are considered messages such as an initial INVITE request for a new session or an OPTIONS

  message for checking capabilities.

  There are different SIP headers/parameters that identify the dialogs and transactions, and they will be analyzed in later posts.

  References: https://telconotes.wordpress.com/2013/03/13/sip-transactions-vs-dialogs/

• Question 177:

  Refer to the exhibit.

  

  Which ephone-dn can join the hunt group whenever a wild card slot becomes available?

  A. ephone-dn 1
  B. ephone-dn 2
  C. ephone-dn 3
  D. ephone-dn 4
  E. ephone-dn 6
  C. ephone-dn 3

  ---

  References: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/command/reference/cme_cr/cme_e1ht.html

• Question 178:

  Refer to the exhibit.

  

  A user is going through a series of dialing steps on a SIP Type B IP phone (for example, a Cisco 7975) to call an SCCP IP phone. Both phones are registered to the same Cisco Unified Communications Manager cluster. Assuming that the calling SIP phone is not associated with any SIP dial rules, which statement about how digits are forwarded to Cisco Unified Communications Manager for further call processing is true?

  A. Each digit is sent to Cisco Unified Communications Manager in a SIP NOTIFY message KPML event, at the time that the user enters the digit on the keypad.
  B. The SIP IP phone will wait for the interdigit timer to expire, or for the Dial softkey to be selected before sending each digit to Cisco Unified Communications Manager as a separate KPML event in a SIP NOTIFY message.
  C. The SIP IP phone will wait for the interdigit timer to expire, or for the Dial softkey to be selected before sending all digits to Cisco Unified Communications Manager in a SIP INVITE message.
  D. The SIP IP phone will wait for the interdigit timer to expire or for the Dial softkey to be selected before sending the first digit in a SIP INVITE and the subsequent digits in SIP INFORMATION messages.
  E. The SIP IP phone will send all digits to Cisco Unified Communications Manager in a SIP INVITE message as soon as the fourth digit is pressed.
  A. Each digit is sent to Cisco Unified Communications Manager in a SIP NOTIFY message KPML event, at the time that the user enters the digit on the keypad.

  ---

  KPML procedures use a SIP SUBSCRIBE message to register for DTMF digits. The digits themselves are delivered in NOTIFY messages containing an XML encoded body. And it is Out of Band DTMF

• Question 179:

  Which statement correctly describes the Client Services Framework (CSF) device configuration requirement for a Jabber for Windows client in need of Desktop sharing using Binary Floor Control Protocol (BFCP)?

  A. Enable both Trusted Relay Point and Media Termination Point on the CSF Device
  B. Disable Trusted Relay Point but enable Media Termination Point on the CSF device
  C. Trusted Relay Point and Media Termination Point configuration is irrelevant to BFCP feature on CSF clients
  D. Disable Media Termination Point but enable Trusted Relay Point on the CSF device
  E. Disable both Trusted Relay Point and Media Termination Point on the CSF Device
  E. Disable both Trusted Relay Point and Media Termination Point on the CSF Device

• Question 180:

  Which three message types for RTCP are valid? (Choose three.)

  A. sender report
  B. end of participation
  C. source description
  D. sender codec
  E. receiver packets
  F. average MOS
  A. sender report
  B. end of participation
  C. source description